61 lines
2.0 KiB
Plaintext
61 lines
2.0 KiB
Plaintext
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SLIM(Serial Low Power Interchip Media Bus) bus
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SLIMbus is a 2-wire bus, and is used to communicate with peripheral
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components like audio-codec.
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Required property for SLIMbus controller node:
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- compatible - name of SLIMbus controller
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Child nodes:
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Every SLIMbus controller node can contain zero or more child nodes
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representing slave devices on the bus. Every SLIMbus slave device is
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uniquely determined by the enumeration address containing 4 fields:
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Manufacturer ID, Product code, Device index, and Instance value for
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the device.
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If child node is not present and it is instantiated after device
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discovery (slave device reporting itself present).
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In some cases it may be necessary to describe non-probeable device
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details such as non-standard ways of powering up a device. In
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such cases, child nodes for those devices will be present as
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slaves of the SLIMbus controller, as detailed below.
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Required property for SLIMbus child node if it is present:
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- reg - Should be ('Device index', 'Instance ID') from SLIMbus
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Enumeration Address.
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Device Index Uniquely identifies multiple Devices within
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a single Component.
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Instance ID Is for the cases where multiple Devices of the
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same type or Class are attached to the bus.
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- compatible -"slimMID,PID". The textual representation of Manufacturer ID,
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Product Code, shall be in lower case hexadecimal with leading
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zeroes suppressed
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Optional property for SLIMbus child node if it is present:
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- slim-ifc-dev - Should be phandle to SLIMBus Interface device.
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Required for devices which deal with streams.
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SLIMbus example for Qualcomm's slimbus manager component:
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slim@28080000 {
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compatible = "qcom,apq8064-slim", "qcom,slim";
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reg = <0x28080000 0x2000>,
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interrupts = <0 33 0>;
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clocks = <&lcc SLIMBUS_SRC>, <&lcc AUDIO_SLIMBUS_CLK>;
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clock-names = "iface", "core";
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#address-cells = <2>;
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#size-cell = <0>;
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codec_ifd: ifd@0,0{
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compatible = "slim217,60";
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reg = <0 0>;
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};
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codec: wcd9310@1,0{
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compatible = "slim217,60";
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reg = <1 0>;
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slim-ifc-dev = <&codec_ifd>;
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};
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};
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